<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea v-model="msg" placeholder="请输入要评论的内容（不超过120字" max="120"></textarea>
    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
        <div class="cmt-title">
          第{{i+1}}楼&nbsp;&nbsp; 用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time|dataFormat}}
        </div>
        <div class="cmt-body">
          {{item.content==='undefined'?'该用户很懒，尚无评论。':item.content}}
        </div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
import {Toast} from 'mint-ui'

export default {
  components: {
  },
  data(){
    return {
      pageIndex:1,//默认显示第一页数据
      comments:[],
      msg:''//评论输入的内容
    }
  },
  created(){
    this.getComments()
  },
  props:["id"],
  methods:{
    getComments(){//获取评论
          this.$axios({
          method:'get',
          url:'/api/getcomments/'+this.id+"?pageindex="+this.pageIndex,
      }).then((response) =>{          //这里使用了ES6的语法
          //console.log(response)       //请求成功返回的数据
          if(response.data.status===0){
              //this.comments = response.data.message
              //加载更多时，不覆盖，而是拼接
              this.comments = this.comments.concat(response.data.message)
          }else{
              Toast('获取评论失败！')
          }
      }).catch((error) =>{
          console.log(error)       //请求失败返回的数据
      })
    },
    getMore(){//加载更多
      this.pageIndex++;
      this.getComments()
    },
    postComment(){//发表评论
      var params = JSON.stringify({    //这里是发送给后台的数据
                artid:this.id,
                content:this.msg.trim(),
          })
      this.$axios({
          method:'post',
          url:'/api/postcomment/'+this.id,
          data:params
      }).then((response) =>{          
          if(this.msg.trim().length===0){
            return Toast('评论内容不得为空！')
          }
          //console.log(response)       //请求成功返回的数据
          if(response.data.status===0){
            var cmt = {user_name:'匿名用户',add_time:Date.now(),content:this.msg.trim()}
            this.comments.unshift(cmt)
            this.msg = ''
          }else{
            Toast('评论失败！')
          }
      }).catch((error) =>{
          console.log(error)       //请求失败返回的数据
      })
    }
  }  
}
</script>

<style lang="scss" scoped>
.cmt-container{
  h3{
    font-size: 18px;
  }
  textarea{
    font-size: 14px;
    height: 85px;
    margin: 0;
  }
  .cmt-list{
    margin: 5px 0;
    .cmt-item{
      font-size: 13px;
      .cmt-title{
        line-height: 35px;
        background-color: grey;
        border-color: #ccc;
      }
      .cmt-body{
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>
